This is missable and is unlocked in the fourth (final) story.
You will gain control of your character and be able to walk around the environment. You're free to explore and there are two achievements you can get in this area, one for collecting four cassette tapes (one in each room) and this one.
Leave the room you start in and head to where the corridor takes a right turn. Ahead of you is a ward, and outside of it is a hand sanitiser dispenser. Use it! Sanitise your hands, people.
As a reward for being Covid-aware and sanitary-conscious, you can have an achievement.